Oxidation State
Table J
REDOX
Electrochemical Cells
Electrochemical Cell Diagrams
200
What is the oxidation state of Cl in Cl2
0
200
Which metal is more reactive, Ba or Mn?
Ba
200
What substance is oxidized in the following REDOX reaction?
Ca(s) + AlCl3(aq) --> Al(s) + CaCl2
Ca
200
What happens at the anode in a voltaic cell?
Oxidation / electrons lost
200
According to the electrochemical cell diagram,
Which substance would represent the anode?
Zn
400
What is the oxidation state of Cr in Na2CrO4
+6
400
Which element is more reactive, F or I?
F
400
What substance is reduced in the following REDOX reaction?
2FeBr3(s) + 3F2(g) --> 2FeF3(s) + 3Br2(g)
F2
400
What is the charge of the cathode in an electrochemical cell?
positive
400
According to the electrochemical cell diagram,
Which electrode would gain mass as the cell progresses?
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Cu, Copper
600
What is the oxidation state of Fe in Fe(NO3)3
+3
600
Which element is more likely to be oxidized, Zn or Co?
Zn
600
How many electrons are transferred in the following unbalanced REDOX reaction?
Fe(NO3)2(aq) + Mn+2(aq) --> Mn(NO3)7 + Fe+3
5 electrons
600
Where are electrons transferred in an electrochemical cell?
Through the wire
600
According to the electrochemical cell diagram,
What would be the direction of flow of electrons?
From Mg to Ag
800
What is the oxidation state of Mn in KMnO4
+7
800
Which element is more likely to be reduced, Cl or Br?
Cl
800
When the following redox reaction is balanced, what is the coefficient in front of I-1?
Fe3+ + I-1 → Fe2+ + I2
2
800
Which electrode will negative ions flow in an electrochemical cell?
anode
800
According to the electrochemical cell diagram,
Would the pencil that is producing oxygen gas, O2, be the anode or the cathode?
Anode
1000
What is the change of oxidation state for carbon, C, in the reaction CH4 + 2O2 --> 2H2O + CO2?
-4 to +4
1000
Which element is more likely to be oxidized, Cu or F?
Cu
1000
When the following redox reaction is balanced, what is the coefficient in front of NO2-?
N2O4(g) + Br-1 + OH-1 → NO2-1 + BrO3-1 + H2O
6
1000
A voltaic cell has an anode, cathode, electrolyte solutions, wires and a voltmeter that records the voltage output as 0. Why is the most likely reason there no voltage?
Missing a salt bridge
1000
What direction would EACH ion in solution flow according to the diagram?
Na solid on the cathode, Cl bubbles on the anode